Burner for combustible gases.



G. M. HUNTER.

BURNER FOR COMBUSTIBLE GASES.

APPLICATION TILED MAR. 3, 1913.

11,071,053, amt-lemma Aug. 26, 1913.

Fwy

burner embodying my invention, Fig. .3

a transverse section of the valve portion of l llD CAMPBELL MURRAYHUNTER,

OF LONDON, ENGLAND.

BURNER FOR COIVIBU'S'IIBLE GASES.

actress.

Specification of Letters Patent.

Patented Aug. 26,1913.

Application filed March 1913. ScrialNo. 751,881.

To (1 whom it may concern Be it known thatl, CAMPBELL MURRAY Howrhu, asubject of the King oi the United Kingdom Great Britain and. Ireland,residing at 'lQ ondon, in the county of Middlesex, England, haveinvented certain new and useful Improvements in Burners for CombustibleGases; and I do hereby declare the following to be a full, clear, and.exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates more especially to the construction of burners ofthe inductor type, and has for its objects the utilization of eithernatural, producer, or coal gas under a widely varying range of pressureconditions, including vacua; and the thorough and intimate admixture ofthe gas with the air necessary for eitecting complete combustion and thegeneration or production of aBunsen flame of uniform intensity.

The burner is simple in form, economical in construction, and certain inoperation.

To this end the main feature of my invention, 'enerally stated, embracesthe combination in a gas burner, of a chamber having adelivery nozzle, ahelical blade or vane located in said nozzle, and a trumpet shapedmixing chamber having valve con trolled air ports, said ports beingcircumferentially disposed with relation to the nozzle; also a centrallydisposed steam jet designed to act as a powerful inductor or exhausterin cases where it is desired to draw the gas from a source at lowpressure or to create a vacuum inthe source of supply.

There are other, minor, features of invention, all as will hereinaftermore fully appear.

In the drawings chosen for the purpose of illustrating this invention,the scope where of is pointed outin the claims, Figure 1 is alongitudinal central section of a gas is the mixingchamber, the nozzle,and the helical blade or vane, taken in the plane of the line 2.-2, Fig.1, and Flg. 3 1S a vertical transverse section of the gas chamber, steamjet pipe, and stem of the needle valve, taken on the line 83, Fig. 1.

Like symbols refer to like parts wherever they occur. I I will nowproceed to describe my invenartto which it appertains may apply thesame.

In the drawings, 1 indicates the gas chamber of the burner with whichthe gas supply pipe G connects. This gas chamber-preferably is of theusual pear shape common to injectors, its outlet 1 constituting a narrowthroat leading to a delivery nozzle 1".

2 indicates the steam jet pipe with which the steam supply pipe Sconnects. This steam jet pipe '2'is centeredwith the throat or outlet 1of the gas chamber 1, and is controlled by the usual or any approvedform of as at 3*, where it passes through the rear wall of the gaschamber 1.

Any suitable means for manipulating the needle valve 3 may be provided.In the present instance a hand wheel 4 on the stem 3 is shown. i

The gas chamber of the burner is shown as provided with threadedopenings 9 and s for the reception of the threaded ends of the gassupply pipe G and the steam supply pipe S.

Located in the nozzle 1 is a helical blade or vane 5 which may be ofsheet iron twisted into a helix of any desired pitch, said helical bladeor vane having for its function thcimparting to the stream of gas, orsteam, or gas and steam, issuingfrom the throat 1 of the gas chamber 1 awhirling motion as it emerges from the nozzle 1.

6 indicates a trumpet shaped or flaring mixing chamber for the gas andair, the in-- ner end of which chamber incloses the nozzle 1 and isprovided with a series of air ports (i for admission of the air which isto intermingle with the gas. The air ports 6 are preferably oflongitudinally tapering form, equally spaced circumferentially aroundthe end of the trumpet shaped mixing chamber 6. In order to control saidair ports 6, a rotary sleeve valve 7 is mounted on the rear ,tion morefully so that others skilled in the needle valve 3, the stem of which isthreaded end of the mixing chamber 6, said valve having. ports 7corresponding in size with the air ports 6 of the mixingchamber, each ofsaid ports guarded by a substantially tangentially disposed guide plateor flange 7 which, when ports 6" are open, causes the entering air toassume a rotary motion in the same sense as the whirling gas streamemitted from nozzle 1.

The construction of the burner being substantially that hereinbeforepointed out, its operation will be as follows: Gas is first ad mittedfrom the gas supply pipe G into the gas chamber 1 of the burner and isignited at the outer end of the trumpet. If the pressure of the gas asadmitted to gas chamber 1 is insutficientin itself to cause therequisite amount of gas to flow through the burner steam is admittedfrom steam supply pipe S into steam jet pipe'2 and the needle valve 3 ismanipulated to pass the amount of steam necessary to obtain the requiredvelocity of flow in the gas passing from the gas chamber 1 throughthroat 1 intonozzle 1 The required velocity of flow in the gas beingobtained, a rapidly'whirl- ,ing motion will be imparted thereto, in itspassage-through nozzle 1, by the helical blade or vane 5. This gyratorymotion has the multiple effect of causing, firstly, a thoroughintermixture ofthe gas and steam, secondly, the throwing out from suchmixture of. any steam which may have become condensed and which wouldotherwise cool the flame, thirdly, the subsequent and completeintermixture in chamber dot the gas, steam and induced air, which mixingis much aided by the differing specific gravi ties of thesteam, gas andair. The air ports and the point of ignition is located just beyond themouth of the trumpet-s .ped mixing chamber 6.

Owing to the substantially tangential'position of the guide plates orflanges 7, the

air currents entering at ports 6 guided thereby Will have a direction ornation tangential to the axis of the burner and Slmllar'to that of therotating current of gas or gas and steam which will facilitate andaugment the induction-of the air and its admixture with the gyratingcurrent of gas in the mixing chamber.

, As hereinbefore noted, my invention is applicable to burners foreither natural, producer, or coal gas.

The burner will work effectively with gas at any pressure, and in caseswhere the pressure is sutficlent for the gas to attain a high enoughvelocity to induce the necessary volume of air no steam is necessary.

The action of the burner. will also be et' fective without steamwherever sufiicient chimney draft is available to materially assist theflow of air through the air ports of the mixing chamber.

There it is desired to utilize the burner for burning natural gas froman oil or gas well, if the pressure of the gas is suflicient the steaminduction jet need not be used, but, where the gas pressure is low. oras frequently happens, it is found desirable to tion in the 'gas'pipe;and further, where two or more burners are drawing from the same mainsupply pipena delicate type of not return valve should be provided 1neach of the pipes leading to the respective burners,

as indicated at 9, Fig. 1.

In order to obviate any danger from back-' firing a gauze damper 10 maybe inserted in the gas inlet pipe in any suitable manner.

The burner has incorporated with it as an integral part of itself apower producing apparatus capable of drawing the fluid fuel from asource below atmospheric pressure it necessary or desirable, and isdistinct from others inasmuch as it combines the functions of a gasburner with those of a gas exhauster or pumping device.

Having thus described my invention, what I claim and desire to secure byLetters Patent is: v

1. A gas burner comprising a gas chamber having a contracted exit throatand a delivery nozzle leading therefrom, a helical blade or vanearranged in the nozzle, and a mixing chamber having at its 'rearcircumferential valved air ports which surround the nozzle of the gaschamber.

2. A. gas burner comprising a gas chamher having a contracted exitthroat-and a deliv ry nozzle, a steam jet delivering into the exitthroat of the gas chamber, a helical blade or vane arranged in thenozzle, and a mixing chamber having at its rear circum ferential valvedair ports which surround the nozzle of the gas chamber. 3. A gas burnercomprising a gas chamber having a contracted exit throat and a deliverynozzle, a helical blade or vane arranged in the nozzle, a mixing chamberhaving at its rear circumferential valved ports which surround thenozzle of the gas chamher, and substantially tangentially disposedguides for directing the air currents through the air ports of themixing chamber.

l. gas burner comprising a gas chamber having a contracted exit throatand a delivery nozzle, a steam jet delivering into the exit throat ofthe gas chamber, a helical blade or vane arranged in the nozzle, aniixing chamber having at its rear circumferential air ports surroundingthe nozzle. and a 10 rotary valve sleeve having substantially tanin thepresenee of two subscribing witnesses. 15

CAMPBELL MURRAY HUXTEP.

Witnesses H. D. Junzsox, R. VESTACOTT.

